Vitamin D is probably the most important vitamin that is associated with the function of the immune system. People with frequent infectious diseases have low levels of vitamin D. The recommended daily dose of vitamin D is 200 - 2000 IU but that is definitely not enough to meet the needs of a healthy person, especially in our climate zone.
Vitamin D is best obtained naturally from the sun. For example, when sunbathing, we expose the largest possible area of skin to the sun's rays and thus supply the body with vitamin D. In autumn and winter it is almost impossible for us to get vitamin D from the sun in sufficient quantities, that is when vitamin D supplements come in handy. In addition to dietary supplements and sunshine, you can also take vitamin D from fish, beef and eggs.
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